JPH01501096A - thermal conductivity detector assembly - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] thermal conductivity detector assembly field of invention The present invention relates to a constant resistance thermal conductivity detector, and more specifically, to a constant resistance thermal conductivity detector. Relating to a thermal conductivity detector assembly specifically for use in matography It is.

Background of the invention In gas chromatography, the components to be analyzed are stored in a precisely stored gas or or by injecting the vaporized sample into an analytical column. Career Ga The column contains a column containing suitable packing material to selectively separate the components of the sample. transport the sample through the system. The components to be analyzed elute from the column. Suitable for detecting the pressure and emitting an appropriate output signal proportional to the me of the component in the sample. A detector is provided. For this purpose e.g. flame ionization detectors, flame photometric GB type detectors such as detectors and thermal conductivity detectors can be used for YJL. Each format Although thermal conductivity detectors have certain advantages and disadvantages, thermal conductivity detectors are easy to maintain. It is safe to use, and it is highly sensitive to the components of microorganisms, so it is difficult to use chromatographs. I found it very useful.

Thermal conductivity detector is a resistor that detects changes in the thermal conductivity of the test gas in contact with the sensor. A force 6 thermal metal filament or a thermistor is used as the element. predetermined mW The sensor, which is heated to zero force, is first contacted by a carrier gas and The gas cools the resistive element at a constant rate that varies depending on its thermal conductivity.

The change in temperature of senna is related to its resistance and the voltage required to maintain its temperature. Both currents are affected. The test component elutes from the column and flows past the resistance element. When the thermal conductivity of the test fluid, which is different from the carrier fluid, changes the temperature of the resistive element, The salinity of a resistive element again depends on the changes in voltage and current required to maintain it's temperature. Therefore, it will be reflected. Such changes in current or voltage may cause It is recorded as a measure of the concentration of the test gas. However, they cannot be used for thermal conductivity detectors. There are some differences that may affect the results obtained. For example, heat transfer Conductivity detectors can suffer from traditional thermal delays as the resistive element heats up and cools down. However, such thermal delays can make the detector elements less sensitive and reduce response times. It may be the result of eliminating the ° Resistance elements in efforts to eliminate thermal delays Reducing the dimensions of the resistor element has led to an increase in the temperature at which the resistor element operates. deer However, overheating the resistor element will cause physical damage to the resistor element and eventually cause it to There is a possibility that it will be destroyed. Replacement of the thermal conductivity detector element requires that the device When used to monitor industrial processes etc., all maintenance and calibration of the equipment is required. I need it.

This may result in loss of production time.

In addition to the above, the design of the detector cell containing the resistive element is also very important. However, if the cell design is poor, the heat loss from the resistive element will be excessive and the associated This may result in erroneous fc results. The temperature of the carrier and sample in the separation column The salinity of the air immediately adjacent to the sensor can also be controlled by the temperature of the carrier and sample. Inadvertent condensation of the sample and the resulting concentration of the sample as well as undesirable changes in This is very important to prevent changes in temperature. In this regard, conventional chromatographs In rough conditions, the temperature of the detector block, sensor and separation column may be controlled separately. The column and cell thermometers were measured by controlling the column and cell thermometers.

This method requires the use of complex circuitry and expensive controllers to block the detector block. Achieving strict control over the respective temperatures of the column, sensor and separation column. It is difficult. These temperature fluctuations result in instrument drift and loss of sensitivity. There is a possibility that

Column temperature and detector block salinity can be controlled using a single heater and controller sound. Efforts have led to the creation of a somewhat cheaper device. However, such a device It is not possible to achieve the exact temperature = < + a that generally gives the best results; Devices like hydrogen carrier gas are designed to be cheap, so It was found that it is unsafe to use in This means that hydrogen gas is It is widely used as a carrier gas throughout the world because of its properties and desirable thermal conductivity properties. It is undesirable.

Summary of the invention The present invention provides at least one resistive filament in which a resistive filament for the flow of sample gas is arranged. Gas chromatograph assembly (G O assembly). Cell and sample gas and gas chromatograph minutes Means is provided for communicating with the carrier gas from the remote column. thermal conductor is configured to support the separation column in heat transfer relationship with a thermal conductor.

According to the invention, the assembly components, including the interior of the cell and separation column, are integrated into a single heated by a heating element, the heating element being controlled by a single heating element control means; It will be done. The temperature of the environment of the sensor, switching valve and separation column is therefore controlled by a single constant temperature control. controlled via the control device. The operating temperature of the resistive filament of the detector is By separate constant temperature power supply to stabilize the temperature difference between filament and cell controlled. Resistive heat detectors achieve high stability temperature control and reduce signal-to-noise ratio The detector is mounted in close proximity to the thermal conductor of the detector, allowing for greatly improved thermal conductivity.

By greatly improving the signal-to-noise ratio, the f# degree of the analyzed gas is very low. Thermal conductivity can be measured using a filter.

All connections of this assembly are suitable for testing explosive or flammable gas mixtures. Both have a flame-resistant design to allow safe use of hydrogen carrier gas. Ru.

In a preferred form of the invention, the GO assembly forms at least one heat transfer surface. form a heat transfer plate with cells placed inside and a corresponding heat transfer surface that rests on the heat transfer plate. a detector block comprising a detector block, the corresponding heat transfer surface being a heat transfer surface of a heat transfer plate; The heat transfer plate transfers heat from the heat transfer plate to the initiator block. Pressure-resistant capillary inside the cell and contact the darkness with the sample and carrier gas. The sensor is a Whetstone Bridge. detect all unbalances of the bridge used as output signal in the circuit The sensor is connected to a comparator to keep the temperature and resistance of the sensor constant. control the power generated. A resistive heat detector is placed adjacent to the sensor housing within a thermal conductor. Provided to detect changes in cell temperature. Resistive heat detectors can be A single heating device in a stone bridge circuit supported by a conductive pour. It is connected via a comparator to a phase control device which controls the phase of the circuit going to the position.

Depending on the change in cell temperature, the phase control device controls the output of the heating device and changes the circumference inside the cell. The ambient temperature is controlled below αO1'C. The same heating device and circuit can be used for separation columns and The temperature of the sample and carrier gas can also be controlled by controlling the temperature of the attached switching and flow control valve. The eyes should be kept within a strictly controlled eye field.

In a preferred form of the invention, at least one pair of sensors is located separately within the detector block. placed in each cell, with one sensor operating at a lower temperature than the other. As a result, samples with low concentrations of test gas can be used in sensors operating at high temperatures. The high temperature sample is passed through the cell where the sensor is at a low temperature. I'm trying to make it possible. In this way, the sensor can be exposed to excess 8 degrees of test gas. Extend sensor life by avoiding sensor overload or sensitivity loss due to exposure to Bus. Alternatively, separate sensors and cells can be used to test more than one type of test gas at the same time. Operates for use with two different carrier gases to allow detection can be set.

In addition to the temperature of the sensor element itself, the surroundings of the cell itself in which the sensor is located By tightly controlling the ambient temperature, the difference between the sensor temperature and the cell's ambient temperature stabilizes and maintains constant conditions, extending sensor life and reducing thermal delays and detector sensitivity. reduce the resulting losses. In addition, it is recommended to improve the response speed of the detector. Creates sharper and more beautiful curves, and reduces tailing mainly due to thermal delay within the sensor. to save.

Brief description of the drawing The present invention can be easily understood and utilized from the following detailed description of the invention and the accompanying drawings. I'm sure you'll recognize the point correctly.

FIG. 1 is an exploded perspective view of a gas chromatograph assembly of the present invention; FIG. 2 is a diagram illustrating the flow of the test gas and carrier gas through the assembly. An enlarged scale plan view of the assembly of 5 is a cross-sectional view taken along line 3-3 in FIG. 2, and FIG. 4 is a cross-sectional view of the sensor filament processed. Schematic diagram of an electrical circuit controlled by heating, FIG. 5 is a schematic diagram of the electrical circuit controlling the heating element; FIG. 6 is a schematic diagram of the electrical circuit used in the invention; an enlarged scale cross-sectional view of the sensor assembly; 7 is an enlarged scale cross-sectional view of a portion of the sensor housing assembly of FIG. 5; FIG.

Detailed description of the invention Looking at Figures 1 to 5, the gas chroma shown generally as 10 The tograph assembly supports a detector block 14, which will be explained more fully later. Heat transfer plate 12t - comprising a base plate 11 preferably provided with receiving holes 11a; Ru. The base plate 11 is mounted on a frame suitable for supporting the gas chromatograph assembly 10. and for installing the case or cover used on the gas chromatograph assembly. It has a different structure. The upper surface of the heat transfer plate 12 forms a heat transfer surface 18a. A raised central portion 18 is provided. Inside the raised central part 18 The cavities 19a, 19b and 19c are arranged, and the mouth of the cavity is connected to the heat transfer surface 1g. open to a. The floor of each cavity 19a, 19b and 19c has a post 20 and a through hole 2. 1. The heat transfer plate 12 is placed in the radial direction from the raised central portion 1g. It has a complete set of outwardly spaced protrusions or fins 22; A chromatographic column 92 can be placed between them as described in more detail in Wear. In another embodiment, the chromatographic column 92 has fins on the column. It is wrapped around the outer surface of the fin-shaped portion 22 in order to perform heat exchange between the two. detection The container block 14 is a cylindrical cell body that is received in the central hole 25 of the mounting plate 211. It is equipped with 15. The lower surface of the mounting plate 21+ connects the detector block 14 to a heat transfer plate. When attached to the upper surface of the raised central portion 18 of 12, it contacts the heat transfer surface 18a. A heat transfer surface 2L1ai is formed. The contact between the heat transfer surface 18a and the heat transfer surface 211a The area is designed to prevent flames from escaping between the heat transfer plate 12 and the detector block Enough length to give a flame path long enough to detector block lli Any suitable means of holding onto the heat transfer plate 12 may be used, but is not safe. For maintenance, a sinking bolt that can be received by a screwdriver 26 in the heat transfer plate 12 is used. to ensure that the bolts do not break accidentally while the detector assembly is in use. On the other hand, at the same time, use special tools to maintain the sensor housing or for other purposes. It is highly preferred that the material be easily removed.

The opposite side of the heat transfer plate 12 is received in the hole 11a of the base plate 11 and has an annular heating element 3 It is provided with an annular groove 28t for receiving and tightening 0. Heating element 0 is heat transfer plate 1 It may be made of any material that can uniformly heat the surface of 2. Preferred embodiment , the heating element 50 is stacked between compressible and flexible sheets of silicone rubber. It includes layered grip heating elements.

In the assembled state, the heating element 30 is located between the base plate 11 and the heat transfer platework 2. Slightly compressed and uniform contact with the heat transfer plate? between the heating element and the heat transfer plate. Ensure maximum heat transfer is possible.

For the reasons stated above, the detector assembly 10 is placed around the fc heat transfer plate 12. The base plate 11 is fixed by a sinking bolt 32 disposed in a counterbore passage 35. installed on. The floor of the hole 11a is provided with a hole 55 corresponding to the hole 21 of the heat transfer plate. It has one base plate 11 and communicates with each of the cavities 19a, 1s, and 19c. be able to.

Detection of detector block 11I as shown more clearly in FIGS. 5.6 and 7. The output cell body 15 has a pair of axially extending cells in which the sensor assembly UO is disposed. It has five cells. The cell body 15 is equipped with a collar 56 equipped with a screw attachment 37a. The screw holder 37a is connected to the corresponding screw holder 37b on the mounting ri 211. A sunken cap screw (5g) is placed to secure the cell body and mounting plate in position. has been done.

The underside of the collar 56 and the surface 41 of the cell body 15 are connected to the cell body for maximum heat transfer. The contact surface area between the mounting plate 211 and the mounting plate 211 is increased to create a flame path that prevents flame from escaping. It works to create. Each senna assembly 110 includes an elongated bushing 1J2 and a bushing 112 is provided with a threaded outer surface lI4 and is connected to corresponding screws in the walls of the three cells. Flame-resistant threaded engagement is possible. Open end with hex bolt on one end The sensor bush 112, which is shaped as a head IJ6, is inserted through the sensor sleeve. Stretch and apply flame resistant botting material 50, such as epoxy, into the sensor sleeve. Thus, the sensor filament 118'ff held: assembled. sensor phy When attached to the cell body 15, the lament II8 crosses over the sensor sleeve 142. and extends into the three cells and is exposed to the sample gas and carrier gas within the cells. hexagonal The end of the sensor bushing forming the bolt head 116'i is connected to the raised center of the heat transfer plate. Part 18, 9#119a, extends from sensor filament i+g. A conductive wire 55 that extends is connected to a terminal block 56 that rests on the boss 20 within the cavity. ing. A flame-resistant cable (not shown) from the sensor control circuit connects the base plate 11 and heat transfer The terminal blocks extend through aligned holes 35 and 21 in each of the plates 12. 96 and is connected to the sensor assembly IIO and sensor system, which will be described in more detail later. Complete the electrical connection with the control circuit (Figure 1+).

The sample gas extends through a passageway 122a in the wall of the cell body 15 and enters the interior of the cell. are guided into each of the three cells by capillary tubes 122 opening the pores. As shown, the cell Body 15. has three pairs of cells, so it requires two capillaries 122. Ru. Capillary tubes 124 extend from the interior of each of the three cells to direct the sample gas out of the cells. . The capillary tubes 122 and 12I4 are pressure tested and mounted in a flameproof manner on the wall of the cell body 15. It is preferable to be kicked. The geometry of the three cells follows generally stated principles. There may be several types of operation. Thus, for example, the flow rate through the cell If is large, it is best to shorten the retention time. On the other hand, one component of the sample gas The flow rate should be large if the fraction is retained in the chromatographic column for a short period of time. is not desirable. Therefore, a once-through type where the gas flows through the cell at a small flow rate is also possible. The sample gas may be in a discrete form, held within the cell. It's okay. As an alternative, the cell geometry is may be different for different cells within the detector housing of the present invention. greater flexibility and analytical possibilities for

The heating element 30 provides a heating element circuit (FIG. 5) which is described in more detail below. To the conductor 66 extending from the element to the terminal block 72 placed in the sky @19c Therefore, they are electrically connected. The flameproof cable from the heating device control circuit is located Extend through matching holes 21 and 55 to terminal block 72 to complete the heating device control circuit. do. A resistive heat detector 76 is connected to the inside of the cavity 19a for heat detection. It is arranged in a chamber 77 formed in the wall of cavity 19c immediately adjacent to the cell depression. It is placed. A lead 78 from the heat detector 76 is connected to the terminal block 72. , complete the connection between the heat detector and the heating device control circuit.

Referring to FIG. 2, column switching valves 86 and 88 and flow restriction valves 90a, b and C is mounted on the base plate 11 in a relationship that radiates heat to the heat transfer plate 12.

The chromatographic column 92 is wound in a spiral shape and includes the fins 22 and the heat transfer plate 12. It is arranged in a space formed between the raised central portion 1gc and the raised central portion 1gc. aforementioned As in, the chromatographic column may be wrapped around the outer surface of the fin 22. Alternatively, a chromatographic column may be placed in both positions. sample An inlet line 911 leads from an inlet (not shown) to a chromatographic column 92. It passes through the ram switching valve 86 and the conduit 96. The sample passed through the entire chromatography column 92. Thereafter, it is returned to the switching valve 86 via a conduit 98. It depends on the setting of the switching valve 86.

Samples may also be sent directly from the device through line 100 without being analyzed. Or pipe 10! , throttle valve 90b and conduit 106f: may be discharged through stomach. Pipe line 108 communicates with pipe line 102 via valve 86 and also connects to sample all-switching valve 88. lead to. A carrier gas is directed to the apparatus through line 112 from a source (not shown). ing. The pipe line 1111 is directly separated from the pipe line 112 and connected to the throttle valve 90a and the column. It communicates with a conduit 180 via a switching valve 86. After all, there is a connection from pipe 112. The conduit 116 is a carrier gas throttle valve 90c, a conduit 118, and a switching valve 88. and is carried to the column switching valve 86 through the ib valve 90ai. The analysis sample comes from the switching valve 88. Received into detector cell body 15 through tubes 8122 and 124' and connected to conduits 126 and 124'. and 128.

Although not shown, the entire gas chromatograph assembly 10 and its attached maple coil, flow Throttle valves, switching valves, etc. are surrounded by a layer of thermal insulation, and the entire assembly including insulation is It is housed in the shell of a suitable casing.

Referring now to FIG. 4, the signal output from the sensor assembly 40 is detected and the senna assembly A circuit for controlling the temperature of each resisting filament 8 of the volume is shown.

This circuit includes a sensor connected to each leg of the Whetstone bridge. There is a filament 11g, a resistor 137.1'58 and a variable resistor 139. Ho The Itstone bridge has an input connected to a DC current source, not shown. It has terminals 141 and 11+2'i. Whetstone Bridge also has a pair of Output terminal 11 connected to bridge tWFa to differential amplifier 11i6 having all differential terminals 111 and 1115 and input terminal 11 through line 11i8 and transistor 150i. 12 is provided with an output terminal 1117i connected to the output terminal 1117i.

In operation, filament 118 is heated to the desired operating temperature and bridge 13 I+ is in equilibrium with the carrier gas flowing past the resistive filament? Be taken.

When the sample gas contacts the filament, its different thermal conductivity increases the filament's temperature. This does not result in increasing or decreasing the strength of the filament, as the wetting increases or decreases the filament's strength. The equilibrium of the stone bridge will be removed. The increase in filament bow is bridge 131 i increases the negative potential at the input terminal 11111 of the differential amplifier 1. 46 to delay reducing the current through filament 118, thus reducing the Reduce the temperature of the component and return the bridge circuit to equilibrium. Increased filament resistance The change in polarity due to is a measure of the amount of sample gas that contacts the filament. Fi A decrease in filament resistance has the opposite effect, requiring an increase in current to the filament. Ru.

The selection of the circuit that controls the temperature of the sensor and measures the output from the sensor is a matter of personal preference. However, many circuits such as the one shown above are available in the art for this purpose. It is well known. Note that the method used to power the detector By applying a constant voltage across the detector, the output signal of the detector is at the midpoint of the bridge. Commonly used techniques include applying a constant current through a detector that is unbalanced in voltage. It may also be a method in which Another method is to control the feedback voltage, which is the output signal. It is a constant temperature method that uses controls to maintain a balanced bridge. This is on top This is the method described in connection with FIG. Another method is to use a second bridge circuit and a constant average temperature technique using a bridge circuit within feedback control. the origin of it The force signal is the voltage imbalance across the second bridge. Constant temperature shown in Figure 4 The electric current method is the preferred method for applying current to the detector.

Referring to FIG. 5, the ambient temperature inside the five cells in the sensor housing 110 A circuit for controlling the heating element 30 for precise field control is shown schematically.

This circuit also has a temperature sensor 76 and a resistor 153 tone bridge km. The Whetstone bridge circuit connects the power terminals 15 and 7 to the current source and then to the terminal. It is connected to ground at terminal 158 .

The output from the Whetstone bridge appears at output terminals 160 and 161 and its The signal is sent to a differential amplifier, shown generally as 163, and then multiplied by It is sent to a divider 161+ and a summing amplifier 165.

The signal is then passed to an AC phase controller 66 where the current to the heating element 50 is controlled. It will be done. Digital analog connection 167, which may be operated by a computer, is an AC phase control is used to control the set point of controller 166.

In operation, the Whetstone bridge circuit allows the heating element to reach the desired ambient temperature. Set the variable resistor 155T to the low resistance value of the sensor to be able to Balance is achieved by doing so. The AC phase control device 166 controls the entire alternating current. the heating element heats the heat transfer plate 12; . Heat from the heat transfer plate is transferred to five cells. When the temperature reaches point 7, the brittle The current is essentially in equilibrium and the summing amplifier 165 reaches a stable output. surroundings When the temperature rises above the desired temperature, the increase in temperature is detected by the resistance temperature detector 76. is detected and the signal from that detector complains to the Whetstone bridge circuit. to balance. The signal is sent to differential amplifier 165, which in turn connects integrator 161J and The AC phase controller 166 signal is sent through the adder and adder booster 165'fc to determine the heating requirement. The phase of the current going to element 30 is changed. The phase controller is designed to reduce the current phase. , which causes the heating element 30 to reduce its heat output and transmit it to the five cells. reduce the amount of heat generated. The resulting cooling of cell 59 is also caused by the 41f sensor. 76 to reduce the resistance to cause cooling and return the bridge circuit to equilibrium. .

Now that we have explained the operation of the filament sensor circuit and heater circuit, we will move on to the gas chroma Both the sensor circuit and the heater circuit are connected to the sensor circuit to explain the operation of the tograph assembly 10. Filament IIg and temperature sensor 76 are heated to the temperature selected for the desired temperature. is set to be in equilibrium with an essentially static output when the

The temperature difference between the filament sensor and the ambient temperature of its respective cell is large. It should be understood that the higher the value, the greater the sensitivity of the sensor. For the same reason If the sensor temperature is high, the filament life will be shortened, and filament replacement and detection A complete recalibration of the instrument may be required. Therefore, in a preferred embodiment of the invention In this case, the sensor housing contains a pair of three cells. sensor assembly u The sensor filament II8 of one of the sensors is connected to the sensor filament of the other sensor assembly. If the lament is set to operate at a lower temperature and the sample with higher concentration A sample with a low concentration is sent to a cell containing a sensor that operates at a high temperature. It is directed to the cell containing the sensitive senna that will work. The ambient cell temperature is Since it is the same for both cells, only a single temperature sensor is required for the entire detector assembly 10. Not necessary to maintain virtually uniform temperature throughout the body. Similarly, the fin-like portion 22 Chromatograph coils and valves 86, 88 and 90a, b, and ct cells It radiates heat in such a way as to bring it to almost the same temperature. Keeping the above in mind, each Sensor assembly! OK6 sensor filament) 11g has pre-selected it. When the operating temperature is reached, the carrier gas absorbs the heat radiated from the fins 22. so that it can flow through the chromatographic column 92 which is heated by be made into The three cells also absorb heat from the heating element 50 which is transferred to the fins 22. Conduction brings them to the 8th degree. In this way, a single heating element and A control means is used to effect heating of both the cell 39 and the chromatographic column 92. It will be done. The sample is injected into line 96 and then to column switching valve 86 . Conduit 11 Carrier gas entering through 2t flows to column switching valve 86 through wD valve 90a. , where the carrier gas is mixed with the sample. Then the sample and carrier gas mixture is a chromatograph in which suitable packing materials are placed to separate the components of the sample. Passes to Fukaram 92. The components of the sample leave the chromatographic column 92 and are removed from the column. The sample is returned to the switching valve 86 and then passed through the conduit 108i to the column switching valve 88. The gas components are directed to either cell 39 through line 122 or line 121J. detected by each sensor filament l18 placed within the cell. be done. The resulting signal is sent through the sensor circuit as described above.

Therefore, in a preferred embodiment of the invention, the column switching valves B8 can be switched manually or automatically to alternate the flow through the The detection is carried out in one cell with a sensor filament 48 that operates at a relatively low temperature. The sensor filament lI8 operates at a relatively high temperature. be detected within the file. Cell ambient temperature and filament circumference The selection of ambient temperatures will depend on the nature of the sample being analyzed, and the specific selection of those temperatures will depend on the technique. It is within the range of normal heat sources for the technique.

However, as mentioned earlier, if there is a large temperature difference between the filament and its surrounding temperature, The larger the value, the greater the sensitivity and response of the sensor. Minimize flow disruption during valve switching , a second column (not shown) was added to provide additional separation in another example. ) may be inserted between the column switching valve 88 and the conduit 1211.

In the alternate mode of operation, the detector assembly 10 of the present invention detects one or more sample components. It can be used to detect minutes. In this mode of operation, each The temperature of the sensor filament lI8 in the five cells is investigated with a specific carrier gas. It is set according to the thermal conductivity of the test sample being tested. In this mode of operation , the column switching valves 88 alternately switch to direct the flow of sample through the cell.

In this manner, each cell operates independently to extract specific components. for example, Cell 3IIf: May be used to detect hydrogen in nitrogen, while cell 36 It is used to detect nitrogen in the carrier gas of the gas.

If a detector assembly constructed in accordance with the present invention is It has been demonstrated that it is possible to provide a full peak of 1 volt for even low quantities. F When measuring nitrogen in the carrier gas shell, the filament temperature is 5oO℃. The ambient temperature of the cell was maintained at 60°C. However, the ambient temperature of the cell While the lament temperature is always maintained between 300℃ and 500℃, It may be kept between 0°C.

Although preferred embodiments and modifications have been described in the foregoing description and illustrated in the drawings, The details of the invention have been modified in the details of the construction and in the combination and arrangement of parts. You will understand what can be accomplished without straying from God and scope.

FIG. 6 F/θ7 Handbook Supplementary Book July 15, 1988 Yoshi, Commissioner of the Patent Office 1) Takeshi Moon (Mr. Examiner) 2. Invention (name of →, finger movement convex e classification thermal conductivity detector assembly 3. Person who corrects Relationship to the incident: Patent applicant Address: 92620 California, USA. Grescentia Harmon Re Inn 5281' 61. Number of inventions increased by amendment Invention 7, subject of amendment Power of attorney, specification ・Translation of claims international v4 review report

Claims (16)

[Claims] 1. a thermal conductive cell forming at least one cell in which a thermal conductivity sensor element is disposed; a conductor and a sample separation hand carried in heat transferring relation thereto by said thermal conductor; a sample portion for contacting the sample and carrier gas with the thermal conductivity sensor; directing fluid into the cell through separating means and contacting the thermal conductivity sensor; means for electrically connecting the thermal conductivity sensor element to the thermal conductivity sensor element; to heat the thermal conductivity sensor to the operating temperature and resistance value and increase the thermal conductivity. means for controlling power to the thermal conductivity sensor according to a resistance value of the sensor; electrically connected to the conductivity sensor element to increase the signal received from the thermal conductivity sensor; means for displaying the width, and a means for heat transfer between the cell and the sample separation means via the heat conductor. heating means in communication with each other and a heating means disposed within the thermal conductor adjacent to the cell; A detector is provided to start the heating means and adjust the output of the heating means according to the temperature of the cell. and heater control means for controlling the ambient temperature of the cell to a substantially constant temperature. It features a significantly improved signal-to-sound ratio by keeping the signal at a selected level. gas chromatograph detector assembly. 2. The thermal conductors form a pair of cells, and a thermal conductivity sensor is attached to each of the pair of cells. one of the thermal conductivity sensors has a lower operating temperature than the other sensor. 2. The gas chromatography detector assembly of claim 1, wherein the gas chromatography detector assembly is maintained at a constant temperature. 3. The thermal conductor includes a heat transfer plate forming at least one heat transfer surface and the heat transfer plate. detecting that the heat transfer surface is formed into a corresponding heat transfer surface in which the heat transfer surface is placed on the heat transfer surface. a heat transfer surface, and a corresponding heat transfer surface contacts the heat transfer surface to transfer heat to the heat transfer surface. Gas chromatography detection according to claim 1, wherein the gas chromatography detection is transmitted from the plate to the detector block. Vessel assembly. 4. The heat transfer plate includes a central raised hub, and the top surface of the hub is connected to the detector. forming the heat transfer surface on which the block rests, and at least one cavity forming the said lifting tube said hub having an opening in said heat transfer surface and said cavity having a front end therein; means for connecting the sensor element and the heating element to their respective electrical circuits; and the mouth of the cavity is normally closed by a corresponding heat transfer surface of the detector block. 4. The gas chromatography detector assembly according to claim 3, wherein the gas chromatography detector assembly comprises: 5. The heating means is supported in thermally conductive relationship therewith by the thermal conductor. A gas chromatography detector assembly according to claim 1, comprising a single heating device. 6. Gas chromatograph according to claim 5, wherein the heating device is flexible and compressible. b) Detector assembly. 7. The heating device has an annular shape and is provided on the surface of the heat conductor. 6. The gas chromatography detector assembly of claim 5, wherein the gas chromatography detector assembly is disposed within the groove. 8. between the heat transfer surface of the heat transfer plate and the corresponding heat transfer surface of the detector block. The contact area prevents flame from escaping between the detector block and the heat transfer plate. The gas chromatography detection according to claim 3, wherein the gas chromatography detection method has a flame path sufficient to Vessel assembly. 9. The detector block has a cylindrical cell body and a central hole for receiving the cell body. a mounting plate at one end of the cell body; at least one axially extending cell hole is formed, and the opposite end of said cell body is closed. a radially extending collar is disposed on the cell body adjacent the closed end thereof; , a pair of the mounting plate, the surface of the hole, the cell body in the hole, and the collar; the corresponding surfaces are in contact and the contact area between them is between said cell body and said mounting plate. means in said cell body forming a flame path sufficient to prevent flame from escaping from said cell body; 4. The cell according to claim 3, wherein the sample and carrier gas are limited in and out of the cell. Gas chromatography detector assembly. 10. The thermal conductor defines a pair of cells, each having one thermal conductivity sensor element therein. 10. The gas chromatography detector assembly of claim 9, comprising: 11. Means for access to and from the cell extends radially through the cell to provide access to the cell. It consists of a pair of pressure-resistant capillaries communicating with the sample and carrier. , in communication with a source of gas, and the other of said capillary tubes communicating with a gas vent. Gas chromatography detector assembly as described. 12. The sensor element is held at one end of an open-ended bushing and extends from one end. a filament connected to said filament and extending through the opposite end of said bushing; and a conductive wire electrically connecting the filament to the sensor circuit, The outer diameter of the housing is substantially the same as the inner diameter of the cell so that the sensor element is located within the cell. The gas chromatograph according to claim 1, which is adapted to fit snugly into the gas chromatograph. graphi detector assembly. 13. The inner wall of the cell and the outer surface of the bushing screw the sensor element into the cell. 13. The device according to claim 12, comprising a corresponding threaded element for integrally holding the device. sensor element. 14. The separation means includes at least one packed tower, and the separation means is configured to have a heat transfer function with the heat conductor. 2. A gasket according to claim 1, wherein the contents thereof are heated by said heating means. Chromatography detector assembly. 15. The heat transfer plate further includes an upright shaft spaced radially outwardly from the hub. 5. The gas chromatography detector assembly according to claim 4, further comprising a curved member. 16. 16. The separation column according to claim 15, wherein the separation column is wrapped around the outer surface of the fin-like member. Gas chromatography detector assembly.